c. : a lens or mirror usually of short focal length used to concentrate light upon an object

d. : a device that doffs the web from the carding machine and separates and condenses it into slivers or rovings

e. : an apparatus in which steam or water vapor is condensed to water especially for the purpose of reducing the back pressure in a steam engine or steam turbine, which renders it possible to obtain a greater amount of useful work per pound of steam used

f.

(1) : any of various pieces of apparatus for condensing gases or vapors to a liquid or solid state (as a tube surrounded by cold water in a still) — see still illustration

(2) : a body that accepts heat rejected (as in a refrigerating system or a heat engine)

Webster's New International English Dictionary.Новый международный словарь английского языка Webster.2012